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Metabolic and Signaling Functions of Cancer Cell-Derived Extracellular Vesicles.

Extracellular vesicles have gained tremendous attention in the recent years as a novel mechanism of cell to cell communication. There are several types of extracellular vesicles, including exosomes, microvesicles, exosome, like vesicles, apoptotic bodies that differ mainly in the mechanism of biogenesis and secretion. The most well studied type of extracellular vesicles are the exosomes which are endosome-derived vesicles with a diameter of 50-150nm and enriched in ESCRT proteins including Alix, TSG101, Hsp70, and tetraspanins. It is now well established that exosomes promote tumor growth, alter the tumor microenvironment, facilitate the dissemination of cancer cells in an organotropic manner, modulate immune responses, and mediate resistance to therapy. Exosomes have also been recently implicated in an emerging hallmark of cancer, the cancer cell metabolism. The metabolic state of the cell defines, to a certain extent, both the rate of secretion and the molecular content of tumor-derived exosomes. Furthermore, exosomes have been shown to possess intrinsic metabolic activity since they can synthesize ATP by glycolysis. It follows that exosomes carry a number of metabolic enzymes and metabolites, including lactate, PGE, LDH isoforms, pyruvate, and monocarboxylate transporters. Last but not the least, exosomes are implicated in fatty acid synthesis and cholesterol metabolism and are thought to be crucial for the transcellular metabolism procedure. Uptake of exosomes is thought to alter the intracellular metabolic state of the cell. In summary, we describe the state of the art on the role of metabolism in the secretion, uptake, and the biological effects of exosomes in the metabolism of recipient cells.

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